Does anybody know if these cables are good or will damage the device http://www.amazon.com/JOTO-Standard-Charging-MacBook-Chromebook/dp/B0143QXJIG/ref=sr_1_1?ie=UTF8&qid=1446478578&sr=8-1&keywords=joto+usb+c ?

I bought a couple of them so is there a way that I could test them to make sure they do not damage the device?